<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <!--警告区域-->
      <el-alert title="注意: 只允许为第三级分类修改参数" show-icon type="warning" :closable="false"></el-alert>
      <!--选择商品分类区域-->
      <el-row style="margin:15px 0">
        <el-col>
          <span>选择商品的分类: </span>
          <!--选择商品分类的级联选择框-->
          <!--options用来选择数据源.props用来指定配置对象--->
          <el-cascader v-model="selectedCateKeys" :options="cateList" :props="cateProps" @change="handleChange" clearable style="width:20%"></el-cascader>
        </el-col>
      </el-row>
      <!--tab页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!--添加动态参数的面板-->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible = true">添加参数</el-button>
          <!--动态参数的表格-->
          <el-table :data="manyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染Tag标签-->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{ item }}</el-tag>
                <!--输入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!--添加按钮-->
                <el-button v-else size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!--索引列-->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamsById(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!--添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible = true">添加属性</el-button>
          <!--静态属性的表格-->
          <el-table :data="onlyTableData" border stripe>
            <!--展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--循环渲染Tag标签-->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{ item }}</el-tag>
                <!--输入的文本框-->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!--添加按钮-->
                <el-button v-else size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!--索引列-->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParamsById(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--添加参数的对话框-->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="30%" @closed="addDialogClosed">
      <!-- 内容主体区域-->
      <el-form ref="addFormRef" :model="addForm" :rules="addFormRules" label-width="80px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!--底部按钮区域-->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!--修改参数的对话框-->
    <el-dialog title="修改参数" :visible.sync="editDialogVisible" width="30%" @closed="editDialogClosed">
      <!-- 内容主体区域-->
      <el-form ref="editFormRef" :model="editForm" :rules="addFormRules" label-width="80px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <!--底部按钮区域-->
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //商品分类列表
      cateList: [],
      //级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      //级联选择框绑定的双向数组
      selectedCateKeys: [],
      //激活的页签名
      activeName: 'many',
      //动态参数的数据
      manyTableData: [],
      //静态参数的数据
      onlyTableData: [],
      //控制添加对话框的显示与隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      //添加表单的验证规则对象
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      //修改参数的对话框
      editDialogVisible: false,
      //编辑参数的表单数据对象
      editForm: {
        attr_name: ''
      },
      //控制按钮文本框的切换显示
      inputVisible: false,
      //文本框中输入的内容
      inputValue: ''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取所有的商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败!')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    //级联选择框选中项变化，会触发这个函数
    async handleChange() {
      this.getParamsData()
    },
    //tab页签点击事件的处理函数
    async handleTabClick() {
      this.getParamsData()
    },
    //获取参数的列表数据
    async getParamsData() {
      //选中如果不是三级分类,清空返回
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        //清空数据
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      //根据所选择分类的id,和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: { sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框的输入值
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    //监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    //点击按钮，添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    //打开编辑的对话框
    async showEditDialog(attr_id) {
      //查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.message.error('获取参数信息失败!')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    //监听添加对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    //点击按钮，修改参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    //通过Id删除参数
    async removeParamsById(attr_id) {
      //弹框询问参数是否删除数据
      const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      //如果用户确认删除
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消删除')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/
      ${attr_id}`)
      if (res.meta.status !== 200) return this.$message.error('删除用户失败')
      this.$message.success('删除成功')
      this.getParamsData()
    },
    //文本框失去焦点，或摁下了enter键都会触发
    async handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //如果没有return,则含有内容，需要后置处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      this.saveAttrVals(row)
      row.inputVisible = false
    },
    //点击按钮展示文本输入框
    showInput(row) {
      row.inputVisible = true
      //让文本框自动获得焦点
      //$nextTick方法的作用，就是当页面上元素被重新渲染后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    //发起请求，保存对attr_vals的操作
    async saveAttrVals(row) {
      //发起API请求
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    },
    //删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      //发起API请求删除
      this.saveAttrVals(row)
    }
  },
  computed: {
    //如果按钮需要被禁用，则返回true,否则返回false
    isBtnDisable() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    //当前选中的三级分类的ID
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    //动态计算标题的文本
    titleText() {
      if (this.activeName == 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
